Portable wave detector low frequency receiving voltage sensitivity performance measurer

Abstract

The invention relates to a detector low-frequency receiving voltage sensitivity characteristic test device, which includes a sound field and a circuit device, the sound field device is a sound pressure tank with a driving sound source inside, and the side of the sound pressure tank is equipped with a signal output and a drive input connection socket, The drive input connection socket is connected to the driving sound source through wires in the sound pressure tank, and the signal output connection socket is connected to the standard detector and the tested detector through wires in the sound pressure tank; there is a circular opening on the bottom plane of the tank. It is used to install and fix the driving sound source, and the horn mouth of the driving sound source is fixed on the circular opening; the driving input connection socket in the sound field device is connected to the output end of the power amplifier in the circuit device through a cable, and the two in the sound field device There are two signal output connection sockets, one is connected to the input end of the fixed gain amplifier in the circuit device through a cable; the other is connected to the input end of the programmable gain amplifier in the circuit device through a cable.

Description

technical field [0001] The invention relates to a voltage sensitivity characteristic measuring instrument, in particular to a piezoelectric detector low-frequency receiving voltage sensitivity characteristic testing device. technical background [0002] In the past, the measurement of the sensitivity characteristics of the low-frequency receiving voltage of the piezoelectric detector is usually carried out by using a test system composed of a special measurement box, PC, power amplifier, A / D acquisition card, printer, standard detector, connecting cable and special operating software. , in order to produce a uniform sound field required for measurement and meet the purpose of box shock absorption during the measurement process, the volume of the measurement box reaches 80cm×80cm×80cm, and the weight reaches more than 200-300 kg. In addition, the entire measurement system consists of multiple complete machines and multiple Composed of two independent u...

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Problems solved by technology

[0002] In the past, the measurement of the sensitivity characteristics of the low-frequency receiving voltage of the piezoelectric detector is usually carried out by using a test system composed of a special measurement box, PC, power amplifier, A / D acquisition card, printer, standard detector, connecting cable and special operating software. , in order to produce a uniform sound field required for measurement and meet the purpose of box shock absorption during the measurement process, the volume of the measurement box reaches 80cm×80cm×80cm, and the weight reaches more than 200-300 kg. In addition, the entire measurement system consists of multiple complete machines and multiple Composed of two independent units, the operation is complicated, especially the handling and movement are inconvenient. Therefore, this measurement system is only suitable for testing and calibrating piezoelectric detectors in laboratories, factory workshops and other places.

Since piezoelectric geophones are mostly used in underground mines or in field operations such as rivers, rivers, lakes, and ponds, after a period of use, the performance parameters of piezoelectric geophones will change, and they need to be re-measured at the site of use. Calibration, and the previous test system consisting of the above-mentioned multiple complete machines and bulky measurement boxes is difficult to obtain on-site work

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